[Bug 1802226] [NEW] upgrade to 13.0.1-0ubuntu3~cloud0 caused loss of css

[Launchpad Bug Tracker]

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[Impact]
After upgrading openstack-dashboard pkg,
Because compressed css file name has been changed, 
UI is broken

affected B
UCA Q

keep testing the other releases and will update

flushing or restarting memcached on openstack-dashboard fixes this
issue.

[Test Case]
1. deploy openstack env
2. install old pkg (e.g 13.0.1-0ubuntu1) on openstack-dashboard node
3. apt install openstack-dashboard(this means upgrading)
4. check web page

[Regression]
This patch flushes memcached's cache when installing pkg. It makes re-creating cache again so, it will be slow at first. Basically no effect to running cloud environment.

[Others]


[Original Description]
Using Queens on Xenial.  We updated the packages to the current versions:

~$ apt-cache policy openstack-dashboard-ubuntu-theme
openstack-dashboard-ubuntu-theme:
  Installed: 3:13.0.1-0ubuntu3~cloud0
  Candidate: 3:13.0.1-0ubuntu3~cloud0
  Version table:
 *** 3:13.0.1-0ubuntu3~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/queens/main amd64 Packages
        100 /var/lib/dpkg/status
     2:9.1.2-0ubuntu5 500
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
     2:9.0.0-0ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

Using the Ubuntu theme results in a page full of garbage, missing css.
The browser reports the following in consoles:

The requested URL /static/dashboard/css/6e9a9fafb1ba.css was not found
on this server.

If I use other themes, it seems OK, just this one.

** Affects: horizon (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: canonical-bootstack patch sts sts-sru-needed
-- 
upgrade to 13.0.1-0ubuntu3~cloud0 caused loss of css
https://bugs.launchpad.net/bugs/1802226
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